Broadcast message transmitting and receiving method in a mobile communication system

ABSTRACT

This invention relates to the methods for transmitting and receiving the broadcast message in a mobile communication system. According to the present invention, the broadcast message is appropriately decomposed into the predetermined number of messages at a base station according to the load of a paging channel and to the size of the broadcast message. The decomposed broadcast messages are successively transmitted to a mobile station through the paging channel. The mobile station receives successively the decomposed broadcast messages in the decomposed order and forms a single broadcast message by arranging the received decomposed broadcast messages. For the decomposing process and the receiving process, two broadcast address parameters are added to the existing parameters.

BACKGROUND OF THE INVENTION

The present invention relates to a method of transmitting and receivingbroadcast message in a communication system.

Generally, in the service of a mobile communication system like CDMA,the broadcast message service which is provided to the subscribers ofthe service is provided to the mobile terminal (or a mobile station) ofthe subscribers through paging channels and traffic channels.

There are three methods for transmitting the broadcast message by saidpaging channels. The first is a multi-slot broadcast transmission methodwhich sends the broadcast message to all slots of a control channel soas to send the broadcast message by using all the mobile terminals whichare located in the service area of a base station. This is the simpleand fast method having no time delay in the message. However, thismethod gives a large load to the control channel and makes the processof the other message impossible. The second is a multi-slot broadcastpaging method. This method is one kind of the improved multi-slottransmission methods and transmits the broadcast message after informingall the terminals of the broadcasting by transmitting the general pagingmessages with small size instead of large to all slots of the controlchannel. The third is a periodic broadcast paging method that isprovided by mobile communication service companies. This method decidesthe on/off of the transmission service of the broadcast message and theperiod of the broadcast message by the broadcast index of the field inthe extend system parameter message among the added service informationmessages that are transmitted by the base station, and transmitsperiodic broadcast messages according to the period.

Among the above three methods, the periodic broadcast paging method isthe most effective one and informs the terminals of the fact that thebase station is going to transmit periodically the broadcast messages.Thereafter, when a defined period is passed, this method transmits thebroadcast message. The first slot of the period of which is informed toall terminals is called the reference slot. The general paging messageincluding the broadcast address of the message that will be transmittedin the future is transmitted to this reference slot. From this broadcastaddress information, the terminals decide the type of the message, thearrival time of the message and whether the message is to be accepted ornot. The broadcast message corresponding to each broadcast address mustbe transmitted by the period of three slots after the reference slot.

FIG. 1 is a block diagram showing the network structure of a generalCDMA system.

Referring to FIG. 1, the mobile communication service using basicallythe CDMA system provides radio or wireline communication to the mobilecommunication subscribers by using the public switch telephonenetwork(PSTN) (1) for the general telephone subscribers, which isprovided by the communication network agent, and the integrated servicedigital network(ISDN) (2) providing communication service for both voiceand data by a digital subscriber line.

A mobile switching center (MSC) (3 a) performs a circuit switching and atransit paging processing so that the subscriber is able to communicatewith other mobile subscribers or general wireline subscribers by themobile communication service, performs the functions of hand-off androaming in order to provide a good quality of a communication service,and performs transport layer for the broadcast message transmission (20in FIGS. 2 and 3).

Furthermore, the base station (3 b) is connected with the mobile station(4), which is either in a geostationary position or in moving, by theradio traffic path. Therefrom, the base station (3 b) connects themobile station with the device performing the base station control byradio or wireline path and performs the relay layer (30 in FIGS. 3 and4) for the broadcast message transmission.

Furthermore, the base station contains the information about variouskinds of mobile communication connected with the mobile switchingcenter. Therefore, the base station also contains the current positioninformation of the mobile station (4), the state of the mobilecommunications subscribers, the statistical data about the mobilecommunication and the information concerning to various services. Thereare also the home location register (6) to be connected withradio/wireline subscribers and the visitor location register (5) to beconnected with the mobile switching center (3) in order to search theinformation for processing the paging from other network subscribers.

A cell broadcast center (7) which is an important element in thebroadcast message transmission takes charge of the teleservice layer (10in FIGS. 3 and 4). The short message entity (8) provides the broadcastmessage to said cell broadcast center (7).

The mobile communication service process of the basic network of theCDMA system in FIG. 1 is omitted and only the transmission service forthe broadcast message will be explained here.

Referring to FIG. 1, a communication network agent selects one of thethree broadcast message transmission methods by the paging channelspreviously described.

A short message provider (8) sends the broadcast message which will betransmitted to the cell broadcast center (7) which takes charge of theteleservice layer (10). The broadcast message received by the cellbroadcast center (7) is transmitted to the mobile station (4) throughthe mobile switching center (3 a) which takes charge of the transportlayer (20) and the base station (3 b) which takes charge of the relaylayer (30) shown in FIGS. 2 and 3.

Said base station (3 b) makes said broadcast message contents includedin the data burst message and transmits it to the mobile station (4)through the paging channel by said selected broadcast messagetransmission method.

The multi-slot broadcast transmission method uses the data burstmessage. The multi-slot broadcast paging method and the periodicbroadcast paging method use a general paging message.

The address field in the data burst message or the general pagingmessage is filled with the broadcast address which is the address notthe inborn address of the mobile station (4) but for the broadcastmessage transmission. According to this broadcast address, it is decidedwhether or not the broadcast message is received.

FIG. 4 shows the broadcast address for the broadcast messagetransmission in a conventional system. This address consists of two bitpriority bits (PRIORITY), six bit message identification bits(MESSAGE_ID), eight bit zone identification bits (ZONE_ID), sixteen bitservice bits (SERVICE) and eight bit language bits (LANGUAGE).

The broadcast address will be explained as follows. The two bit prioritybits (PRIORITY) are to determine the priority of the broadcast messagesto be broadcast when a plurality of broadcast messages are transmitted.

The six bit message identification bits (MESSAGE_ID) are to decidewhether or not the current broadcast message is a duplicate copy of themessage which has already been transmitted in order to avoid a duplicatetransmission.

The 8 zone bits (ZONE_ID) are to discriminate an identical messagereceived from a plurality of zones different from each other.

The 16 service bits (SERVICE) are used to classify the broadcast messagetransmission services by their items. The 8 language bits (LANGUAGE) areused as language indicator bits for the classification of the languagesused for the broadcast message.

FIG. 2 shows the protocol stack structure for the broadcast messagetransmission service.

The link layer (40) in the lowest level is a protocol layer forestablishing the connection of communication circuit for thecommunication service.

Relay layer (30) belonged to the base station (3 b) of FIG. 1 is aprotocol layer to discard, when broadcast messages having an identicalbroadcast address are received overlapping in time within a broadcastperiod, the overlapping message. Relay layer (30) also takes charge ofthe communication path allocation, the address establishment andrelease.

Transport layer (20) belonged to the mobile switching center (3 a) is aprotocol layer for the broadcast message transmission between the cellbroadcast center (7) and the base station (3 b) and takes charge of thepaging connection management, data classification and data flow control.

Teleservice layer (10) belonged to the cell broadcast center (7) is aprotocol layer to provide the broadcast message transmission service bybroadcast message subparameters.

In order to transmit the broadcast message provided by the broadcastmessage subparameters of the teleservice layer (10), the transmission ofthe broadcast message is achieved by the parameters provided from thetransport layer (20), the relay layer (30) and the link layer (40) whichare the protocol layers lower than the teleservice layer (10).

FIG. 5 shows the broadcast message subparameters of said teleservicelayer (10). All the subparameters may be used selectively and generallyinclude a message identifier, a user data, a SMC type stamp, an absoluteavailability period, a relative availability period, a priorityindicator, a message delivery notice, and a language indicator.

FIG. 3 shows the primitive type of the relay layer (30) and thetransport layer (20) in the structure of the protocol stack.

There are 4 steps in the primitive between said two layers which are arequest step requesting the processing of an arbitrary work, anindication step informing of said requested work, a response stepresponding to said informed work, and a confirm step confirming theresponse to the request.

The relationship between the relay layer (30) and the transport layer(20) by the primitive is explained as follows.

After the request step requesting the broadcast message transmission inthe transport layer (20), said relay layer (30) sends an indication tothe transport layer (20) to inform of the broadcast messagetransmission. At this time, the transport layer (20) sends a responseindicating whether or not allowing the broadcast message transmission.

To the response signal, the transport layer (20) performs said broadcastmessage transmission by the confirm step of the relay layer (30).

In the broadcast message transmission method according to theconventional arts described beforehand, a paging channel transmittingsaid broadcast message has a slot whose maximum length is 96 bytes.Except for header of the paging channel and error rate control bit(CRC), the length of the slot for transmitting the practical broadcastmessage is 80 bytes. However, the length of the broadcast message needsone to three slots.

Thus, the length of the slot for the broadcast message of the pagingchannel is limited to 80 bytes. Therefore, the following problems springup.

First, if the broadcast message is practically transmitted to one slot,enough contents cannot be transmitted by the message and therefore theservice is impossible.

Second, the size of the data being transmitted by the paging channel asa control channel is generally fixed. However, it a large amount ofmessage is required to be transmitted, a bottle neck occurs. Hence, onlywhen a successive space having enough size for transmitting the messageis prepared by a transmission specialty, the broadcast messagetransmission is possible. However, since the size of the broadcastmessage is larger than that of the paging message, it is difficult tosecure enough space when a large amount of paging message istransmitted.

Third, when the broadcast message having the size of two or three slotsis transmitted through the paging channel, the size of the message istoo large and the probability with which the paging message for ageneral call processing is not transmitted increases. Furthermore, thequality of the service for the general call processing decreases.

Fourth, if the priority is given to the paging message and then thepaging message is transmitted in order to protect the service quality ofthe general call from decreasing, the broadcast message does not secureso much space as it needs and therefore all the message cannot betransmitted and the broadcast service is impossible.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to provide a broadcastmessage transmitting and receiving method in a communication systemregardless of the load of a paging channel.

Another object of the present invention is to provide a broadcastmessage transmitting and receiving method in a communication systemwhose paging channel operates in a good stability and a good efficiencyby distributing the instantaneous load of the paging channel

Another object of the present invention is to provide a broadcastmessage transmitting and receiving method in a communication systemwhose paging channel is in a stable operation as well as transmits alarge amount of broadcast message.

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, the presentinvention makes it possible that a single broadcast message receivedfrom a cell broadcast center is decomposed into the predeterminedmaximum number of decomposition in a base station and each decomposedbroadcast message is transmitted to a mobile station. Therefore, in thecase that there is not a successive space having a sufficient size onthe paging channel, the decomposed message as much as the empty spaceappearing on the paging channel at the corresponding time is discretelytransmitted to the mobile station. The method according to the presentinvention includes the step decomposing the broadcast message into aplurality of messages whose size is not larger than the maximumdecomposition number according to the load of the paging channel and thesize of the broadcast message in a base station, the step transmittingsequentially the decomposed broadcast messages to the base stationthrough the paging channel, the step receiving sequentially thedecomposed broadcast messages by the mobile station, and the stepobtaining a single broadcast message by connecting the sequentiallyreceived broadcast messages.

In order to implement this method, a segment count parameter (SEG-CNT)and asegment sequence parameter (SEG-SEQ) are used. Each decomposedbroadcast message in said steps has its own broadcast address and eachbroadcast address has said two parameters. When a single broadcastmessage is decomposed into the predetermined number of messages, thesegment count parameter (SEG-CNT) of each broadcast address is filledwith the number by which the broadcast message is decomposed. Thesegment sequence parameter (SEG-SEQ) of each broadcast address is filledwith the numbers from the minimum number to the maximum number in thedecomposed sequence. The information about the segments is written inthe broadcast address field of the broadcast page and the broadcast pageis written in the reference slot which is the first of the slots to betransmitted on the paging channel. On the other hand, the mobile stationmonitors this reference slot and decides the broadcast message and itslocation to receive by the information of the broadcast address includedin the reference slot. Therefore, the transmission of a large amount ofbroadcast message is possible regardless of the load of the pagingchannel and it is possible to effectively use the paging channel.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain the principles of theinvention:

In the drawings:

FIG. 1 is a block diagram showing the network structure of aconventional CDMA system.

FIG. 2 is a diagram showing a structure of the protocol stack used inthe service of the broadcast short message.

FIG. 3 is a diagram showing the primitive type of between the relaylayer and the transport layer in the protocol stack used in thebroadcast short message.

FIG. 4 is a table showing the general field parameters of the broadcastaddress for the transmission of the broadcast message.

FIG. 5 is a table showing the subparameters of the broadcast message.

FIG. 6 is a table showing the field parameters of the additionalbroadcast address according to the present invention.

FIG. 7 is a flow chart showing the decomposition process of thebroadcast message according to the present invention.

FIG. 8 is a diagram showing the exemplary of transmitting the decomposedbroadcast messages according to the present invention in the periodicbroadcast paging method.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings.

For the explanation of the present invention, figures used for theconventional techniques will be used.

The present invention is applied to the third method of the threeconventional broadcast message transmission methods. The method of thepresent invention is to decompose a single broadcast message into aplurality of message units in the base station and to transmit thedecomposed messages in sequence to the mobile station. Therefore, ifthere is no successive space having a sufficient size for transmitting aplurality of the messages at the same time, the amount of message asmuch as the empty space that is generated at the corresponding time istransmitted from the base station to the mobile station by the priorityorder. The number of the decomposed message units is determined by theload capacity of the corresponding paging channel.

Since the network structure of the CDMA communication system forimplementing the broadcast message transmission method according to thepresent invention is the same as the conventional system, the processfor the contents of the broadcast message to be included in the databurst message at the base station (4) of FIG. 1 and the process for themessage to be transmitted by the corresponding paging channel, theprocess for the messages to be transmitted through the paging channeland the process for the general page message to be transmitted will beomitted. However, first, the address format of the broadcast message tobe included into the data burst message or the general paging message isexplained as follows.

In the present invention, the address format of the conventionalbroadcast message described in FIG. 4 is used as it is. However, aformat for the broadcast address field shown in FIG. 6 is added to theconventional address format.

FIG. 4 is explained beforehand. Therefore, the explanation about FIG. 6will be done.

Referring to FIG. 6, the field parameter (SEG-CNT) indicates thesegmentation count field and the field parameter (SEG-SEQ) indicates thesegmentation sequence field. Furthermore, the field parameter (RESERVED)has a reserve bit length. As shown in FIG. 6, the length of one byte isrequired for the broadcast address field added according to the presentinvention. The parameter (SEG-CNT) has a two bit length and theparameter (SEG-SEQ) a two bit length. On the other hand, the reserveparameter (RESERVED) has s four bit length.

Hence, referring FIG. 7, it will be explained that the broadcast messageis decomposed by using the field parameters (SEG-SEQ, SEG-CNT) in thebase station and the decomposed messages are transmitted to thecorresponding mobile station.

FIG. 7 is a flow chart showing the process for decomposing the broadcastmessage in the base station.

Before the detailed exemplary embodiment according to the presentinvention is explained, the process for transmitting and receiving thebroadcast message according to the method of the present invention isbriefly introduced.

First, a general page message including the broadcast pages is loadedwithin the first slot of the broadcast paging cycle and then istransmitted from the base station to the mobile station. After then, theremaining messages are successively transmitted.

If the first broadcast message is decomposed into three smallerbroadcast messages, the base station transmits the three burst messagesto the mobile station.

Each data burst message is transmitted within its broadcast slotconcerned.

If the mobile station is configured so as to receive the broadcastmessage, the mobile station monitors the allocated paging channel slots.

If the mobile station receives the decomposed broadcast messages and thereceived broadcast message is not the last one, the mobile stationstores the received broadcast message in a temporary buffer and waitsthe last broadcast message.

After the mobile station receives the last broadcast message, the mobilestation merges all the received data and sends the signal (RL-DATA)including a parameter (CHARi fields) to the transport layer.

Hence, based on the explanation above, one embodiment according to thepresent invention is explained.

The base station (4) of FIG. 1 receives the broadcast short message fromthe cell broadcast center (8) by the primitive type shown in FIG. 3. Thebase station (4) transmits the received broadcast short message to thepaging channel. At this time, the parameter (SEG-CNT) is filled with thenumber 0. After then, on the paging channel, it is checked whether ornot the parameter (SEG-CNT) is filled with the number less than or equalto three. If the parameter (SEG-CNT) is filled with the number largerthan three, the broadcast short message is sent to the mobile station(4) by the traffic channel. If the parameter (SEG-CNT) is filled withthe number less than or equal to three, it is checked whether or notthere is a sufficient space on the paging channel for transmitting allthe current broadcast messages. If there is a sufficient space on thepaging channel, the base station(3) transmits the broadcast shortmessage to the mobile station through the paging channel. If the spaceis not enough, the single broadcast message is decomposed into maximumthree segments which can be processed by the paging channel according tothe message length. After then, the step for checking the number of thesegmentation count parameter (SEG-CNT) is performed. On the other hand,if the broadcast message being transmitted by the base station (4)matches the size of the single slot on the paging channel, in otherwords, if the broadcast short message is not decomposed, thesegmentation count parameter (SEG-CNT) is filled with zero. However, ifthe broadcast short message is decomposed, the segmentation countparameter (SEG-CNT) is filled with the same number as the decomposedmessage segments when the broadcast short message is decomposed. Forexample, if the broadcast short message is decomposed into threesegments, the segmentation count parameter (SEG-CNT) is filled withthree. The detailed explanation for the process that the base stationreceives the broadcast short message from the cell broadcast center (7)is explained as follows. In the primitive types for the relay layer (30and the transport layer (20) in FIG. 3, by using the indicationprimitive for the relay layer broadcasting data, the broadcast shortmessage is transmitted to the transport layer (20) of FIG. 3. However,as described beforehand, if the size of the broadcast short message istoo large to be transmitted by a single slot on the corresponding pagingchannel, the base station (4) decomposes and then transmits the shortbroadcast message.

On this occasion, the short broadcast message which is included into thecharacter field (CHAR FIELD) of the data burst messages to betransmitted by the paging channel and is transmitted can be decomposedinto maximum three segments according to the length of the message andthe load quantity of the paging channel.

When the decomposed broadcast messages are included in the data burstmessage, the segmentation sequence parameter (SEG-SEQ) is filled withthe numbers one to three in sequentially increasing order.

In other words, when the short broadcast message is decomposed, theparameter (SEG-SEQ) is filled in the sequence of the decomposedmessages. Therefore, when the short broadcast message is not decomposed,the parameter (SEG-SEQ) is filled with the number 0. However, when theother parameter (SEG-CNT) is filled with the total number of thedecomposed messages that are not zero, the number 0 which fills theparameter (SEG-SEQ) does not mean that the short broadcast message isnot decomposed.

FIG. 8 is a diagram showing an exemplary embodiment for transmitting thedecomposed broadcast message. In FIG. 8, the numeral 34 indicates thenumber of slots of the paging channel. Four broadcast addresses areincluded in the zeroth slot, that is, the reference slot. The firstbroadcast message is decomposed into three small messages. Therefore,the number of the practical broadcast is two. FIG. 8 also shows theexample in which the first broadcast message is transmitted after beingdecomposed into three messages and the second broadcast is transmittedwithout being decomposed. In other words, the first broadcast message isdecomposed into three messages having a proper size in consideration ofthe transmission load.

Furthermore, the first segment sequence parameter (SEG_SEQ) is filledwith one. The second segment sequence parameter (SEG_SEQ) is filled withtwo. The third segment sequence parameter (SEG_SEQ) is filled withthree. The segment count parameter (SEG_CNT) is also filled with three.They are transmitted to a mobile station after filling the correspondingslots, respectively. The second broadcast message is transmitted withoutbeing decomposed because the space for transmission is sufficientlysecured. In other words, the segment sequence parameter (SEG_SEQ) isfilled with zero and the segment count parameter (SEG_CNT) is alsofilled with zero. This means that the broadcast message is notdecomposed.

As described beforehand, when a single broadcast message is transmittedafter being decomposed into more than one messages, ie., two or three,each of the decomposed messages has its own broadcast address differentfrom each other and the segment count parameter (SEG-CNT) is filled thetotal number of the decomposed messages. The segment sequence parameters(SEG_SEQ)s whose number is equal to the number included in the segmentcount parameter (SEG_CNT) are filled with one, two or three according tothe decomposed order). Therefore, the broadcast addresses of thedecomposed broadcast messages whose number is equal to the decompositionnumber are transmitted to the reference slot.

The operation procedure of the receiving mobile station (or terminal) isexplained as follows.

The mobile station (4) which can receive the broadcast messages watchesthe paging channel that is its own control channel. The mobile station(4) receives the general page message including the broadcast addressesby the reference slot for the broadcast messages. After then, among thebroadcast addresses included in the general page message, the mobilestation selects the broadcast address corresponding to the broadcastservice that is supposed to be received by the mobile station user. Themobile station (4) makes a decision on receiving the broadcast messageand then receives the broadcast message having the selected broadcastaddress. The broadcast message corresponding to the broadcast addressreceived in the reference slot can be received from the slot having therelation to the order (n) of the broadcast address after the referenceslot.

When the decomposition number included in the segment count parameter(SEG-CNT) of the broadcast address of the received broadcast message ishigher than zero, the mobile station decides that a single broadcastmessage is decomposed by the decomposition number included in thesegment count parameter (SEG_CNT). Then, the mobile station stores thereceived decomposed broadcast messages in the temporary buffer andcontinues receiving the remaining decomposed broadcast messages. IfSEG_CNT and SEG_SEQ are not zero, respectively, and the broadcastmessages having the same value are received, the mobile station decidesthat the last broadcast message among the decomposed broadcast messagesis received. Therefore, the mobile station forms a single broadcastmessage by merging the last received broadcast message and thedecomposed broadcast messages stored in the temporary buffer or thedecomposed broadcast messages and then transmits the result to thetransport layer through the RL-DATA Indication primitive.

If the mobile station does not receive all the decomposed messages bythe end of next broadcast period, the mobile station dismisses thedecomposed broadcast messages stored in the temporary buffer.Furthermore, if the parameter MESSAGE_ID in the broadcast address of thereceived broadcast message the mobile station is identical to theparameter MESSAGE_ID included in the broadcast address of the previouslyreceived broadcast message, the mobile station in the conventionaltechniques recognizes the received message as a duplicated message anddismisses the latter received message. However, according to the presentinvention, if SEG_CNT and SEG_SEQ are different even though theMESSAGE_IDs are identical, the received broadcast messages are differentfrom each other and are received by the mobile station.

According to the present invention, the following effects are obtained.

First, the high quality of the basic communication service is securedand at the same time, the short message broadcast service is possible.

Second, the transmission of the broadcast message longer than theexisting short message broadcast service is possible. Therefore, themore information in the existing traffic service can be provided.

Third, the utility efficiency of the limited paging channel isincreased.

What is claimed is:
 1. A broadcast message transmitting method of acommunication system, comprising: decomposing a broadcast message havinga single broadcast address according to the load of a paging channelinto a predetermined number of decomposed messages, each of which has anaddress different from each other; successively transmitting saidpredetermined number of the decomposed broadcast messages to a mobilestation by said channel; successively receiving all said decomposedbroadcast messages through the mobile station; and forming a singlebroadcast message by arranging the received decomposed broadcastmessages, wherein said decomposing said broadcast message into apredetermined number of decomposed messages further comprises confirmingwhether a segment count field parameter is filled with the predeterminednumber that is less than or equal to a previously established maximumnumber; if said predetermined number is less than or equal to thepreviously established maximum number, confirming whether there is asufficient space on said paging channel for transmitting said broadcastmessage; when the space is not sufficient, decomposing said broadcastmessage by said predetermined number; and filling the segment countfield parameter of the broadcast address of each decomposed message withsaid predetermined number, and filling a segment sequence parameter ofthe broadcast address of said each decomposed message with a number froma previously established minimum value to the previously establishedmaximum value according to a decomposed order.
 2. A broadcast messagetransmitting method of a communication system claimed in claim 1,further comprising dismissing the decomposed broadcast messages when themobile station does not successively receive the decomposed broadcastmessages.
 3. A broadcast message transmitting method of a communicationsystem claimed in claim 1, wherein said broadcast message is decomposedaccording to a size of said broadcast message as well as a load capacityof said paging channel.
 4. A broadcast message transmitting method of acommunication system claimed in claim 3, wherein said broadcast messageis decomposed into maximum three segments and then transmitted.
 5. Abroadcast message transmitting method of a communication system claimedin claim 1, wherein said paging channel is the paging channel of saidcommunication system.
 6. A broadcast message transmitting method of acommunication system claimed in claim 1, further comprising transmittingsaid broadcast message without decomposing to said mobile stationthrough said paging channel when the number stored in said segment countfield parameter is higher than said maximum number.
 7. A broadcastmessage transmitting method of a communication system claimed in claim1, further comprising transmitting said broadcast message withoutdecomposing to said mobile station through said paging channel when saidsufficient space is secured for transmitting.
 8. A broadcast messagetransmitting method of a communication system claimed in claim 1,wherein said maximum number is three and said minimum number is one. 9.A broadcast message transmitting method of a communication systemclaimed in claim 1, wherein when said broadcast message is notdecomposed, both said segment count field parameter and said segmentsequence parameter are filled with zero.
 10. A broadcast messagetransmitting method of a communication system claimed in claim 1,further comprising filling said segment sequence parameter of said eachdecomposed message with zero without modifying said segment count fieldparameter of said decomposed broadcast messages in order for thebroadcast address of each decomposed message to have a same broadcastaddress and then to be delivered to said mobile station through areference slot.
 11. A broadcast message receiving method of a mobilestation comprising: preparing a control channel to secure a referenceslot for a broadcast message transmitted from a transmitting station;receiving said broadcast message according to a segment count parameterand a segment sequence parameter which are included in a broadcastaddress of a general page message transmitted through said referenceslot and deciding a location of said broadcast message, wherein saidsegment count parameter is filled with a decomposition number of saidbroadcast message and said segment sequence parameter is filled with anumber from a minimum value to a maximum value according to adecomposition order; deciding whether said received broadcast message isdecomposed by a predetermined number when the decomposition number ofsaid segment count parameter is not zero; if the decomposition of saidbroadcast message is confirmed, receiving decomposed broadcast messagesegments of the broadcast message according to said general page messageuntil said decomposition number stored in said segment count parameteris equal to or less than zero; and when all said decomposed broadcastmessage segments are received, forming a single broadcast message byarranging said received decomposed broadcast message segments.
 12. Abroadcast message receiving method of a mobile station claimed in claim11, wherein said maximum value is three and said minimum value is one.13. A broadcast message receiving method of a mobile station claimed inclaim 11, further comprising: deciding if a next broadcast address of anext broadcast message presently received by the mobile station isdifferent from the number stored in said segment sequence parameter eventhough said next broadcast address is the same as two parametersincluded in the broadcast address of the broadcast message, wherein thetwo parameters are a first parameter for avoiding the duplicate of thebroadcast message and a second parameter for classifying thetransmission service of the broadcast message, the next broadcastmessage is not a duplicate; and accepting the next broadcast message.14. A broadcast message receiving method of a mobile station claimed inclaim 11, further comprising: storing all messages previously receivedby said mobile station in a temporary buffer, if a number of saiddecomposed broadcast message segments previously received by saidtransmitting station is not as high as the decomposition number of saidsegment count parameter; and receiving remaining broadcast messagesegments of said decomposed broadcast message.
 15. A method fortransmitting messages, comprising: decomposing a message having a singlebroadcast address into a predetermined number of decomposed messages,each of the decomposed messages having an address different from others;transmitting the decomposed messages to a mobile station by a pagingchannel; receiving the decomposed messages through the mobile station;and forming a single message by arranging the received decomposedmessages, wherein said decomposing said broadcast message into apredetermined number of decomposed messages further comprises confirmingwhether a segment count field parameter is filled with the predeterminednumber that is less than or equal to a previously established maximumnumber; if said predetermined number is less than or equal to thepreviously established maximum number, confirming whether there is asufficient space on said paging channel for transmitting said broadcastmessage; when the space is not sufficient, decomposing said broadcastmessage by said predetermined number; and filling the segment countfield parameter of the broadcast address of each decomposed message withsaid predetermined number, and filling a segment sequence parameter ofthe broadcast address of said each decomposed message with a number froma previously established minimum value to the previously establishedmaximum value according to a decomposed order.
 16. A method fortransmitting and receiving messages, comprising: decomposing a broadcastmessage into a predetermined number of segments; transmitting thesegments and a general page message including the predetermined numberthrough a paging channel; receiving the segments based on thepredetermined number according to a segment count parameter and asegment sequence parameter which are included in a broadcast address ofthe general page message transmitted through a reference slot anddetermining a location of the broadcast message, wherein the segmentcount parameter is filled with a decomposition number of the broadcastmessage and the segment sequence parameter is filled with a number froma minimum value to a maximum value according to a decomposition order;and forming the broadcast message by arranging the received segmentswhen all decomposed broadcast message segments are received.
 17. Amethod for receiving messages, comprising: preparing a control channelto secure a reference slot for a transmitted message; receiving thetransmitted message according to a segment count parameter and a segmentsequence parameter which are included in a broadcast address of thegeneral page message transmitted through a reference slot anddetermining a location of the broadcast message, wherein the segmentcount parameter is filled with a decomposition number of the broadcastmessage and the segment sequence parameter is filled with a number froma minimum value to a maximum value according to a decomposition order;determining if the received message is decomposed into a predeterminednumber of segments; receiving remaining segments based on thepredetermined number included in the general page message, if themessage is decomposed; and forming a single message by arrangingreceived segments when the predetermined number is satisfied.
 18. Themethod of claim 11, wherein deciding the location of said eachdecomposed broadcast message comprises: when n is an order of thebroadcast addresses and a number of a SEG-CNT is the same as the numberof said segment count parameter, calculating a value n1 by executing anequation n1=n1+(SEG-CNT−1),where the minimum decomposition number<SEG-CNT< the maximum decomposition number; and evaluating the locationof each message by multiplying said value n1 and said maximumdecomposition number.
 19. The method of claim 18, wherein said maximumdecomposition number is three and said minimum decomposition number isone.
 20. The method of claim 16, wherein decomposing the broadcastmessage into the predetermined number of decomposed messages comprises:confirming whether a segment count field parameter is filled with thepredetermined number that is less than or equal to a previouslyestablished maximum number; if the predetermined number is less than orequal to the previously established maximum number, confirming whetherthere is a sufficient space on said paging channel for transmitting saidbroadcast message; when the space is not sufficient, decomposing thebroadcast message by the predetermined number; and filling the segmentcount field parameter of the broadcast address of each decomposedmessage with the predetermined number, and filling a segment sequenceparameter of the broadcast address of each decomposed message with anumber from a previously established minimum value to the previouslyestablished maximum value according to a decomposed order.